| Parameter |
Value |
| Designation |
P/2020 B4 (Sheppard) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-11-25T07:31:50.350080Z |
| Orbit solution date (soln_date, UTC) |
2023-05-18T19:13:12Z |
| Obs used |
20 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
13.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-01-26T04:22:00.480000Z |
| Discovery magnitude (MPC) |
22.50 r |
| Discovery observatory (MPC) |
807 · Cerro Tololo Observatory, La Serena |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-06-04.0000000 |
| e |
0.19253094 |
| q (au) |
6.438946 |
| a (au) |
7.974232 |
| i (deg) |
11.601007 |
| Ω (om, deg) |
186.003502 |
| ω (w, deg) |
342.456738 |
| M (ma, deg) |
336.394550 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.183 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.183 |
| n |
6.000 |
| gf |
0.935 |
| gb |
-0.981 |
| k |
1.000 |
| δ90 |
7.598 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
17:36:49.49 |
-10:25:01.4 |
HIP 86190 |
35.14 |
| 2026-06-01 12:00 |
17:36:38.93 |
-10:24:37.7 |
HIP 86190 |
34.71 |
| 2026-06-02 00:00 |
17:36:28.34 |
-10:24:14.4 |
HIP 86190 |
34.49 |
| 2026-06-02 12:00 |
17:36:17.71 |
-10:23:51.5 |
HIP 86190 |
34.48 |
| 2026-06-03 00:00 |
17:36:07.05 |
-10:23:29.0 |
HIP 86190 |
34.67 |
| 2026-06-03 12:00 |
17:35:56.35 |
-10:23:06.9 |
HIP 86190 |
35.08 |
| 2026-06-04 00:00 |
17:35:45.62 |
-10:22:45.3 |
HIP 86190 |
35.69 |
| 2026-06-04 12:00 |
17:35:34.85 |
-10:22:24.1 |
HIP 86190 |
36.50 |
| 2026-06-05 00:00 |
17:35:24.06 |
-10:22:03.3 |
HIP 86157 |
37.25 |
| 2026-06-05 12:00 |
17:35:13.23 |
-10:21:43.0 |
HIP 86157 |
38.05 |
| 2026-06-06 00:00 |
17:35:02.38 |
-10:21:23.1 |
HIP 86157 |
39.03 |
| 2026-06-06 12:00 |
17:34:51.50 |
-10:21:03.6 |
HIP 86157 |
40.18 |
| 2026-06-07 00:00 |
17:34:40.60 |
-10:20:44.6 |
HIP 86157 |
41.48 |
| 2026-06-07 12:00 |
17:34:29.67 |
-10:20:26.0 |
HIP 85946 |
42.45 |
| 2026-06-08 00:00 |
17:34:18.72 |
-10:20:07.8 |
HIP 85946 |
42.33 |
| 2026-06-08 12:00 |
17:34:07.76 |
-10:19:50.1 |
HIP 85784 |
40.93 |
| 2026-06-09 00:00 |
17:33:56.77 |
-10:19:32.9 |
HIP 85784 |
38.48 |
| 2026-06-09 12:00 |
17:33:45.77 |
-10:19:16.1 |
HIP 85784 |
36.07 |
| 2026-06-10 00:00 |
17:33:34.75 |
-10:18:59.7 |
HIP 85784 |
33.70 |
| 2026-06-10 12:00 |
17:33:23.71 |
-10:18:43.8 |
HIP 85784 |
31.40 |
| 2026-06-11 00:00 |
17:33:12.67 |
-10:18:28.4 |
HIP 85784 |
29.17 |
| 2026-06-11 12:00 |
17:33:01.61 |
-10:18:13.4 |
HIP 85784 |
27.04 |
| 2026-06-12 00:00 |
17:32:50.55 |
-10:17:58.8 |
HIP 85784 |
25.03 |
| 2026-06-12 12:00 |
17:32:39.47 |
-10:17:44.8 |
HIP 85784 |
23.18 |
| 2026-06-13 00:00 |
17:32:28.40 |
-10:17:31.2 |
HIP 85784 |
21.52 |
| 2026-06-13 12:00 |
17:32:17.31 |
-10:17:18.0 |
HIP 85784 |
20.10 |
| 2026-06-14 00:00 |
17:32:06.23 |
-10:17:05.3 |
HIP 85784 |
18.98 |
| 2026-06-14 12:00 |
17:31:55.14 |
-10:16:53.1 |
HIP 85784 |
18.21 |
| 2026-06-15 00:00 |
17:31:44.05 |
-10:16:41.4 |
HIP 85784 |
17.84 |
| 2026-06-15 12:00 |
17:31:32.97 |
-10:16:30.1 |
HIP 85784 |
17.90 |
| 2026-06-16 00:00 |
17:31:21.89 |
-10:16:19.3 |
HIP 85675 |
16.70 |
| 2026-06-16 12:00 |
17:31:10.82 |
-10:16:09.0 |
HIP 85675 |
14.56 |
| 2026-06-17 00:00 |
17:30:59.75 |
-10:15:59.1 |
HIP 85675 |
12.67 |
| 2026-06-17 12:00 |
17:30:48.70 |
-10:15:49.7 |
HIP 85675 |
11.13 |
| 2026-06-18 00:00 |
17:30:37.65 |
-10:15:40.8 |
HIP 85675 |
10.12 |
| 2026-06-18 12:00 |
17:30:26.62 |
-10:15:32.4 |
HIP 85675 |
9.79 |
| 2026-06-19 00:00 |
17:30:15.60 |
-10:15:24.4 |
HIP 85675 |
10.21 |
| 2026-06-19 12:00 |
17:30:04.59 |
-10:15:16.9 |
HIP 85675 |
11.29 |
| 2026-06-20 00:00 |
17:29:53.61 |
-10:15:09.9 |
HIP 85675 |
12.86 |
| 2026-06-20 12:00 |
17:29:42.64 |
-10:15:03.4 |
HIP 85675 |
14.77 |
| 2026-06-21 00:00 |
17:29:31.69 |
-10:14:57.3 |
HIP 85576 |
15.95 |
| 2026-06-21 12:00 |
17:29:20.76 |
-10:14:51.7 |
HIP 85576 |
15.46 |
| 2026-06-22 00:00 |
17:29:09.86 |
-10:14:46.6 |
HIP 85576 |
15.43 |